Bug#781253: cups: no duplex printing (two-sided) with lp or lpr

[Brian Potkin <claremont102@gmail.com>]

On Thu 30 Apr 2015 at 12:54:09 +0200, Vincent Lefevre wrote:

> On 2015-04-30 10:32:33 +0100, Brian Potkin wrote:
> > Having to switch renderer to get a satisfactory printout is usually an
> > indication of a problem with the printer not dealing with valid
> > PostScript rather than the filtering system.
> 
> Or could this be a bug with the default renderer (Ghostscript?)?
> 
> Or some incompatibility like the following one?
> 
>   http://comments.gmane.org/gmane.comp.printing.cups.bugs/9407

That link leads to

  http://bugs.ghostscript.com/show_bug.cgi?id=693652 ,

which is a pretty comprehensive discussion of the issues with buggy
interpreters. So indeed, this does seem like the problem here. The
contrast between gs and pdftops in Comment 26 is interesting.

Ultimately, I'd go with the simplest explanation; especially when the
outcome is successful printing. Someone with more PostScript knowledge
than I have might look deeper.

Regards,

Brian.